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Dorman 674-940 Exhaust Manifold Kit

Curated from 73 real Reddit conversations

Refreshed on: October 22, 2024

Product Image 1
Product Image 2
Product Image 3

Dorman 674-940 Exhaust Manifold Kit

Brand: Dorman
Price: $79
Snoop Score:
1.6
Sentiment
3.0
Popularity
0.9
Technical
1.4
Buy on Amazon for $79See All Exhaust Manifold Reviews
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Snoop's Take

The Dorman 674-940 Exhaust Manifold Kit is designed as a reliable replacement for select Chevrolet and GMC models, featuring all necessary gaskets and hardware for installation. Many consumers appreciate its cost-effectiveness, with one user noting, "Dorman is just as good as OEM, and is roughly third of a price," while others have praised its performance, stating it, "sounds like a beast." However, some feedback highlights concerns regarding fit and quality, with comments like, "I would not recommend Magnaflow" and a general preference for OEM parts due to reliability issues. Based on the mixed feedback, the Dorman 674-940 Exhaust Manifold Kit may be a suitable option for those seeking a budget-friendly alternative to OEM, but potential buyers should be cautious about reported fit issues and consider the reliability of OEM parts, especially if emissions testing is a factor in their region. Overall, while it offers substantial benefits for budget-conscious consumers, the product may not be the best choice for everyone, particularly those prioritizing fit and long-term durability.

Not for you? Check out our other rated Exhaust Manifold

Dorman is just as good as OEM, and is roughly third of a price.

Positive Feedback

Nope. No Dorman for me.

Negative Feedback
Product
1.6
Dorman 674-940 Exhaust Manifold Kit
Buy on Amazon for $79
Performance Enhancement
1 / 10
Aftermarket Replacements
1 / 10
Custom Repair Projects
1 / 10
Routine Maintenance
1 / 10
See how this compares to all Exhaust Manifold

What it does well!

Key strengths users can’t stop talking about.
Cost-effective compared to OEM options
“Dorman is just as good as OEM, and is roughly third of a price.”➕
“Visually looks identical to OEM, same flex pipe as OEM, not mesh type.”➕
Dorman exhaust manifold holds up nicely
“I went with the Dorman with the flex pipes built into it.”➕
“It sounds like a beast, and it's a manual so I feel like I'm driving a race car lol.”➕

Where it needs some work!

Areas to watch—feedback on possible improvements.
Poor fit and quality issues reported
“Nope. No Dorman for me.”➕
“I would not recommend Magnaflow.”➕
“In my opinion just get the DT LT’s.”➕
“Who else is rocking the infamous Dorman intake manifold? 🤣”➕
Preference for OEM due to reliability and fit
“I'd recommend oem unless you don't have to do emissions testing where you live.”➕
“I’m favoring sticking with the new OEM and the installer that also handles emissions.”➕
“I am going with OEM manifolds at about $300 each with new bolts.”➕
“There really isn't any other option, hopefully someone will prove me wrong.”➕
Quality concerns with Dorman products
“It's much cheaper than Dorman junk. Dornan has a few select good products, but mostly meh.”➕
Fit issues reported with Dorman manifold
“Don’t be like me.”➕
Concerns about Dorman parts causing PCV issues
“Was hoping aftermarket improved on the issue.”➕

Compare On All Talked About Dimensions

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AUTOSAVER88 Exhaust Manifold Catalytic ConverterAUTOSAVER88 Exhaust Manifold Catalytic Converter$142
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Dorman 674-773 Exhaust Manifold KitDorman 674-773 Exhaust Manifold Kit$89
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A-Premium Left Engine Exhaust Manifold KitA-Premium Left Engine Exhaust Manifold Kit$71
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A-Premium Right Side Exhaust Manifold with GasketsA-Premium Right Side Exhaust Manifold with Gaskets$64
6.9
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Dorman 674-937 Exhaust Manifold KitDorman 674-937 Exhaust Manifold Kit$89
6.8
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Dorman 674-685 Exhaust Manifold KitDorman 674-685 Exhaust Manifold Kit$84
6.0
DetailsBuy
A-Premium Right Exhaust Manifold KitA-Premium Right Exhaust Manifold Kit$59
5.8
DetailsBuy
A-Premium Right Exhaust Manifold with Hardware KitA-Premium Right Exhaust Manifold with Hardware Kit$79
5.3
DetailsBuy
A-Premium Engine Exhaust Manifold W/Gasket & Bolts & NutsA-Premium Engine Exhaust Manifold W/Gasket & Bolts & Nuts$76
4.9
DetailsBuy
Dorman 674-152 Driver Side Exhaust Manifold KitDorman 674-152 Driver Side Exhaust Manifold Kit$89
4.9
DetailsBuy
A-Premium Exhaust Manifold with Gasket and BoltsA-Premium Exhaust Manifold with Gasket and Bolts$98
3.3
DetailsBuy
Dorman 674-905 Exhaust Manifold KitDorman 674-905 Exhaust Manifold Kit$96
3.0
DetailsBuy
Dorman 674-940 Exhaust Manifold KitDorman 674-940 Exhaust Manifold Kit$79
1.6
DetailsBuy
A-Premium Left Exhaust Manifold with Gasket & BoltsA-Premium Left Exhaust Manifold with Gasket & Bolts$85
1.3
DetailsBuy

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.
Discussion about alternatives like headers for performance
“Recommendations for replacements? Not opposed to headers.”➕
“Headers do need a tune but I picked up about 20 hp once it was all said and done.”➕
Curious about DIY experiences with exhaust manifold issues.
“It's clear my budget is 10 year old Fords with factory issues 😅 that's okay.”➕
“I don’t think you have to pull cab experienced mechanics can do it in like 45 minutes though.”➕
Discussion on temporary fixes for a cracked manifold
“if you're removing it, you might as well just replace it.”➕
“It may crack again down the line, but it may last forever.”➕
“That needs to be replaced.”➕
“There is a high temp putty that you can get from most auto parts chain stores that is good up to about 2400°f.”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’
Preference for OE manifolds due to fit and reliability.
“Manifold replacement time My 06 470 has recently developed the dreaded ticking at startup. It’s not ”➕
“Just use an OE manifold. They obviously come with new cats and other than occasionally cracking don’t really have any other problems.”➕
“after talking to a few mechanics they said it is unlikely I would feel gains of the after market and the OEM are good enough.”➕
Discussion on costs of OEM vs aftermarket
“It’s the one thing under the hood that absolutely looks like hell.”➕
Discussion about costs of OEM vs aftermarket
“I'm not paying that kind of money for exhaust manifolds.”➕
Discussion on alternatives to OEM bolts
“I probably paid as much for all of them as he's trying to pay for 1 bolt.”➕
“$39 on [Amazon](https://www.amazon.com/dp/B00E5YSH70/ref=cm_sw_r_as_gl_api_gl_i_4NZXF4AX42WA9VEJQ7CT”➕
“Exhaust Manifold Issue Curious on what others have done to deal with the notorious issue with an al”➕
“It’s worth it.”➕
Mention of high costs associated with performance manifolds.
“Replacing the manifolds I thought was the easiest and quickest out of all of them.”➕
Inquiry about replacing a single broken stud instead of the entire manifold.
“can I just replace that stud if it’s broke? Without doing the entire manifold?”➕
Discussion on price differences between aftermarket options and OEM.
“Are the Doorman worth paying 3x as much or do they last no longer than the cheapest?”➕
“Dorman is typically better than oem.”➕
Dorman part number may not match vehicle specifications
“if the rest of it lines up.. oxygen sensor placement does not matter..”➕
“where did you get that part number from? the dorman website cant find it under suzuki, gmc or chevrolet.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.
Skepticism towards aftermarket options.
“I’m probably too skeptical to go that route unless someone can recommend them.”➕
Discussion about durability and noise from exhaust systems.
“Been ticking for a year, but lift was more important than the exhaust noise.”➕
“It's going to be a pita either way.”➕
Skepticism towards aftermarket options
“Dorman sells some shitty shit.”➕
Discussion about durability of exhaust components
“Well... You know it's gotta come to this folks... Give us your Dorman Yay or Nay parts.”➕
Discussion on durability of exhaust components
“this 100% has been my favorite upgrade on my 4runner.”➕
Discussion about aftermarket options for exhaust manifolds.
“I did find that actually, good looking out!”➕
“Its a shitty job.”➕
Discussion on emissions testing implications
“Dorman should say if they are approved in California.”➕
Discussion about various aftermarket options and their reliability
“Finally getting tired of my jeep sounding like a diesel 😂”➕
“so far everything is holding up nicely”➕
“It's holding up fine for about 40k miles now.”➕
Mixed reviews on durability across different models
“There are some scary reviews on Amazon - specifically for the earlier years, apparently EGR tube doesn’t line up?”➕
Concerns about the reliability of aftermarket components
“I am glad to hear that the Dorman has a chance of holding up.”➕
Advice on using longer bolts to prevent breakage.
“If you want them to stop breaking you need 1” longer bolts and 1” spacers.”➕
Discussion on OEM parts failing
“OEM is trash and these are the parts always failing. Get your aftermarket stuff and enjoy a working engine.”➕

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